Isotope ratio measurements
Selected published measurements of carbon (and oxygen) isotope ratios in planets, brown dwarfs, and stars. filling text — revise caption or add selection criteria.
| Target | Category | ¹²C/¹³C | ¹⁶O/¹⁸O | Instrument | Reference | Note |
|---|---|---|---|---|---|---|
| YSES 1 b | super-Jupiter | 88 (13) | none | VLT/CRIRES+ | Zhang et al. 2024 | SupJup III |
| YSES 1 A | star (K3) | 66 (5) | none | VLT/CRIRES+ | Zhang et al. 2024 | SupJup III |
| GQ Lup B | super-Jupiter | 53^{+7}_{-6} | none | VLT/CRIRES+ | González Picos et al. 2025 | SupJup IV |
| GQ Lup A | K6 host-star | 51^{+10}_{-8} | none | VLT/CRIRES+ | González Picos et al. 2025 | SupJup IV |
| AB Pic b | super-Jupiter | 102 (8) | none | VLT/CRIRES+ | Gandhi et al. 2025 | SupJup V |
| CD-35 2722 A | M1 host-star | 132^{+20}_{-14} | none | Keck/KPIC | Wang et al. 2025 | |
| CD-35 2722 B | L4 companion | 159^{+52}_{-41} | none | Keck/KPIC | Wang et al. 2025 | |
| 2MASS J03552337+1133437 (2M0355) | young brown dwarf | 97 (+25 / -18) | none | Keck/NIRSPEC | Zhang et al. 2021 | |
| 2MASS J03552337+1133437 (2M0355) | young brown dwarf | 95 (7) | none | VLT/CRIRES+ | Grasser et al. 2025 | SupJup VIII |
| 2MASS J14252798–3650229 (2M1425) | young brown dwarf | 110^{+11}_{-10} | none | VLT/CRIRES+ | Grasser et al. 2025 | SupJup VIII |
| TWA 28 | young brown dwarf | 81^{+28}_{-19} | H_2^{18}O detection (2.1σ) | VLT/CRIRES+ | González Picos et al. 2024 | SupJup II |
| TWA 28 | young brown dwarf | 75 (2) | 683 (53) | JWST/NIRSpec | González Picos et al | reanalysis of Manjavacas et al. 2024 |
| TWA 27A | young brown dwarf | 79^{+14}_{-11} | 645^{+80}_{-70} | JWST/NIRSpec | González Picos et al | reanalysis of Manjavacas et al. 2024 |
| 2MASS J08561384-1342242 (J0856) | young brown dwarf | 79^{+20}_{-14} | H_2^{18}O detection (3.3σ) | VLT/CRIRES+ | González Picos et al. 2024 | SupJup II |
| 2MASS J12003792-7845082 (J1200) | young brown dwarf | 114^{+69}_{-33} (≈2σ) | none reported | VLT/CRIRES+ | González Picos et al. 2024 | SupJup II |
| 2MASS J08354256-0819237 (J0835) | young brown dwarf | 89 (11) | H_2^{18}O weak detection | VLT/CRIRES+ | Mulder et al. 2025 | SupJup VI |
| 2MASS J05012406-0010452 (J0501) | young brown dwarf | 117^{+20}_{-17} | none reported | VLT/CRIRES+ | Mulder et al. 2025 | SupJup VI |
| 2MASS J05002100+0330501 (J0500) | young brown dwarf | 155^{+56}_{-53} | none reported | VLT/CRIRES+ | Mulder et al. 2025 | SupJup VI |
| DENIS J025503.3-470049 (J0255) | brown dwarf | 184^{+61}_{-40} | none reported | VLT/CRIRES+ | de Regt et al. 2024 | SupJup I |
| HIP 55507 A | K6 host-star | 79^{+21}_{-16} | 288^{+125}_{-70} | Keck/NIRSPEC | Xuan et al. 2024 | |
| HIP 55507 B | M7 companion | 98^{+28}_{-22} | 240^{+145}_{-80} | Keck/NIRSPEC | Xuan et al. 2024 | |
| GQ Lup B | super-Jupiter | 153^{+43}_{-21} | none reported | Keck/KPIC | Xuan et al. 2024 | |
| HIP 79098 b | super-Jupiter | 52^{+22}_{-17} | none reported | Keck/KPIC | Xuan et al. 2024 | |
| DH Tau b | super-Jupiter | 53^{+50}_{-24} | none reported | Keck/KPIC | Xuan et al. 2024 | |
| WISEPA J182831.08+265037.8 (WISE 1828) | brown dwarf | >40 | none reported | JWST/NIRSpec | Lew et al. 2024 | Y dwarf |
| 2MASS J04151954-0935066 (2MASS 0415-0935) | brown dwarf | 97^{+9}_{-8} | none reported | JWST/NIRSpec | Hood et al. 2024 | T dwarf; preprint |
| 2MASS J04151954-0935066 (2MASS 0415-0935) | brown dwarf | 87^{+6}_{-5} | 491^{+66}_{-62} | JWST/NIRSpec | Gonzalez Picos et al. in prep. | T dwarf; dataset from Hood et al. 2024 |
| HD 19467 B | brown dwarf | 146^{+17}_{-15} | 624^{+131}_{-102} | JWST/NIRSpec | Gonzalez Picos et al. in prep. | T dwarf; dataset from Ruffio et al. 2023 |
Source data: _data/isotope_ratios.csv. filling text — credit collaborators or survey name if needed.